**1. Which statement is an accurate description of discrete variables?**

- Discrete variables are qualitative and consist of two or more categories in which order matters.
- They are quantitative with a continuous range of values.
**They are quantitative with a finite set of values.**- They are qualitative and consist of two or more categories of values in which order does not matter.

**2. Which term is used to describe the difference between the highest and the lowest values for a variable?**

**range**- mode
- variance
- standard deviation
- skew

**3. What are two data structures in pandas? (Choose two.)**

- text
**series**- image
- number
**dataframe**

**4. In a graphical reppresentation of the distribution for a discrete variable, what does the X and Y axis reppresent? (Choose two.)**

- skew
**variable****probability**- range
- standard deviation

**5. Which term is used to describe the right and left ends of a distribution graph?**

**tail**- end
- peak
- axis

**6. Which file type is most similar to a dataframe in pandas?**

- a PDF file
**a spreadsheet**- a word processing file
- a multilayer image file

**7. A data analyst studies two variables over a period. Data set A is (100, 90, 81, 73) and data set B is (3500, 3150, 2835, 2552). The Pearson r value between these two variables is 0.99. Which statement describes the correlation between them?**

- It indicates no relationship.
- It is a weak negative correlation.
**It is a strong positive correlation.**- It is a strong negative correlation.

**8. Match the variable with the description.**

**9. What is a measurement of central tendency that is also known as the average?**

- mode
**mean**- median
- Person r

**10. What category of variables includes nominal or ordinal variables?**

- numerical
**categorical**- ratio
- interval

**11. What relationship is an example of causation?**

- a relationship between sensors and actuators in IoT
- a relationship in which two things change at a similar rate
- a relationship between a computer operating system and one or more programming languages
**a relationship when a change in one thing directly results in something else changing**

**12. What is a purpose of using the head Linux command?**

- to determine the size of the file
- to display the permissions on the file
**to verify that the file is available and preview the first few lines**- to determine whether the file contains enough code to be executable

**13. Match the variable with the type of value.**

**14. What term describes the key characteristics that are observed or measured as part of an experiment or analysis?**

**variable**- data set
- statistics
- population

**15. Which term is used to describe a graph of distribution where the peak is left of center or right of center?**

**skewed**- normal
- bimodal
- symmetric

**16. A data analyst performs a correlation analysis between two quantities. The result of the analysis is an r value of 0. What does this mean?**

- The analysis failed.
**The two variables have no relationship.**- Neither variables changed during the period.
- When one variable increases its value, the other variable reduces its value.